It's Japanese. I used Google to translate it, and it looks like you just run the .nds file, then press R. That should configure the EZ4 as a RAM expansion, and soft reset back to the R4 menu (you may need soft reset enabled in the R4 menu for this to work). Then you just run the browser.

This was a crude translation, so there may be a few details left out, but it probably won't be hard to figure out.

You should probably back up the save in the EZ4's SRAM before doing this, just in case. Just start the EZ4 and let it copy the save data to the save file.